Hello

I want to watch a drama where FL has a crush on SML but due to some misunderstanding ML thinks that FL likes him and slowly falls for her. He gets possessive of her. He feels sad when he gets to know that the person FL has crush on is not him but SML. FL also falls for ML unknowingly after spending time with him. She realises her feelings for ML later and they have a happy ending. I would prefer if there are not many scenes of FL and SML.

Moon Lovers: Scarlet Heart Ryeo  - basically what you describe is happening in this drama. She falls for someone else, he thinks she fell for him. etc. etc. 

A River Runs Through It - this has exactly what you described

Wait, My Youth